Charles w



. .0 W HUNT 7 Universal Joint for Hoisting-Block.

Paiented ec. 10,1878.

' To all whom it may toncem:

GEAR-LES W. nose, on i VFEST new elitist-Eros, now some litiPEOVEMEN'? iN UNiVEiT XSAL JSENES F@='-i Specification forming part of Letters Patent N0. ii?.,{@, dated December 10, 1878; applieation filed October 3, 1878.

Be it known that 1; CHARLES W. HUNT, of West New Brighton, State ol'NeW York, have invented new and useful Improvements in Universal Joints for Hoisting-Blunts, whereby the block will stay in any position, nnd yet easily follow any new direction the hoisting-rope nniy lead, ot'vwhieh the following is it specification:

In the drawing accompanying this specifiestion, Figure 1 is a section of the joint of the lioistingbloek. Fig. 2 is :1 side elevation with the sheave Still1(llllgVQ-Ztl021ll 'y'. Fig. 3 is a side elevation with the sheave standing at an zin-v gle from the vertical. Figist is a, horizontal cross-section of the joint of the hoisting-block. The object of this invention is to cause such i'riction between the ball 13 l) and its envelope Ii Fig. 1, that the ball will stay in any posi tion in which it may be placed; and yet be capable of moving to a new position whenever a strain comes upon it greater than the friotion between the bail and its envelope.

To avoid the great expense of accurately fitting up this ball and its envelope, so that the friction between them shall be the some in different positions, I divide the ball into two ports, 13 and D, Fig. l, and place between the two ports aspring, 43, which; by its elestiity, tends to make the ball B D larger, and by its pressure against the rigid envelope E causes the requisite friction to hold; it in euy desired position. The elasticity of the spring 6 makes up for slight inequalities in the spherical portions of the ball, and makes the friction pres tien-lly the some in all positions.

The spring (3 can be made of any material or of any form that experience may show to he the most suitable for the purpose.

Whatl claim as my invention is-.

The divided ball B D or its equivalent, having' it spring, 0, which causes the parts of the hall to press against the rigid envelope E, substantially as described.

CHARLES W. HUNT. Witnesses: 1

' JosN W. ANDREAS, iliinoLn '1. VAN NosTRANn. 

